University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Doctoral Thesis:
Armin Haberl
(2020):
Verjüngung von Gebirgswäldern mit schlitzartigen Eingriffen - Evaluierung der Holznutzung mit Mastseilgeräten.
Doctoral Thesis - Institut für Forsttechnik (FT),
BOKU-Universität für Bodenkultur,
pp 100.
UB BOKU
obvsg
FullText
- Abstract:
- As a result of climate change, the alpine valleys are increasingly threatened by natural hazards. Protection is most efficiently provided by Forests consisting of a mix of spruce, fir and beech. To maintain profitability in management of mountain forest without clear-cuts, the so-called “slit-cut method” has been developed. The effect of applying the slit-cut method on the performance of a Koller K507 cable yarder has been systematically monitored over a yarded volume of 66.000 m³. A time consumption model could be developed. The piece volume had a larger effect on productivity than yarding distance and productivity increases with an increasing larger intervention area. The model explained 48 % of the variation in time consumption. To compare the performance when working in slit-cut method to working in clear-cut, a comparable dataset was retrieved for a Syncrofalke 4to which included yarding operations with a yarded volume of 47,000 m³. It showed that installation time consumption was higher under the slit-cut method, because the corridors had to be cut before installation. A model was developed for estimating installation time consumption in man hours and 46 % of its variation could be explained by yarding distance, yarding direction and treatment type, where time consumption increase with yarding distance and is generally higher in downhill direction. Harvesting costs were € 25,0/m³ in uphill and € 26,8/m³ in downhill yarding operations and thus between 5,8 €/m³ (uphill; +30 %) and 6,0 €/m³(downhill; +28%) more expensive than clear-cutting. The slit-cut method allows profitable forest management. The total cost and revenues of a slit-cut and a clear-cut treatment were compared for a rotation period of 95 years.The economic advantage of the slit-cut method amounted to € 11,723/ha due to higher average timber revenues and lower expenditures. However, at interest rates of 2 %/3 %, its economic advantage skyrocketed to € 133,444/ha/€ 176,134/ha.
- Betreuer: Stampfer Karl
- 1. Berater: Gronauer Andreas
- 2. Berater: Visser Rien Jan Marinus